Fluid power device



y 15, 1951 E. c. OLIVER 2,552,860

FLUID POWER DEVICE Filed June 27, 1945 3 Sheets-Sheet l INVENTOR. I15 '1' 5 5 Eda c. O/iver ATTORNEY May 15, 1951 E. c. OLIVER 2,552,860

FLUID POWER DEVICE Filed June 27, 1945 3 Sheets-Sheet 2 INVENTOR. 4 C. Ol/ver BY fi m/1760,

ATTORNEY FLUID POWER DEVICE Filed June 27, 1945 3 Sheets-Sheei s I-ITEFE INVENTOR.

Edd C. Oliver ATTORNEY Patented May 15, 1951 UNITED STATES PATENT OFFICE FLUID POWER DEVICE Application June 27, 1945, Serial No. 601,890

4 Claims. (01. 103-120) This invention relates to a fluid power device and more particularly to a mechanism especially adaptable as a driven instrumentality or pump utilizing a fluid preferably a liquid, as for exam ple oil as a power transmitting medium, the fluid power device being useable as a fluid motor if desired. When the fluid power device of my invention is utilized as a pump, the rotor of the mechanism derives its rotational movement by applied mechanical or electrical means and functions to pump or convey fluid through the device. When the power device is utilized as a fluid motor, the fluid pressure is directed through the rotor, the fluid pressure causes rotation of the rotor, a transition of fluid pressure to rotary mechanical movements.

The invention embraces the provision of a fluid power device especially adaptable for use as a fluid pump in which the elements and vanes forming fluid receiving and transferring chamhers rotate as a unitary structure whereby friction of moving parts is reduced to a minimum.

An object of the invention resides in the provision of a fluid power device in which units or elements of the device are rotatable about independent axes and which are arranged for relative shifting movements to vary the volume of the fluid transferring chambers formed in the device.

The further object of the invention is the provision of a fluid pump or instrumentality in which the fluid receiving and transferring chambers may be varied and controlled by lateral shifting of an axis of certain of the rotatable.

elements with respect to the axis of other rotatable elements of the pump.

Another object of the invention reside in a fluid pump or instrumentality in which effective pumping of fluid may be had in one direction of fluid flow and at a controllable variable rate by shifting the relative position of the axes of rotation of various elements of the pump, and in which pumping may be eliminated or effective pumping of fluid in a reverse direction accomplished by further relative shifting of said axes, all of it may be accomplished while the elements of the pump are rotating at a constant speed in one direction.

Still another object is theprovision of a variable volume reversible fluid pump in which a component of the pump is laterally movable with respect to the axis of rotation of other components of the pump and in which adjustment and control of the axis may be accomplished through continuous operation of the pump to reduce the pumps effectiveness to zero, or to obtain a maximum pumping effect of fluid flow in either direction without interfering with Or changing the speed of rotation of the pumps rotor construction.

Further objects and advantages are within the scope of this invention such as relate to the arrangement, operation and function of the related elements of the structure, to various details of construction and to combinations of parts, elements per se, and to economics of manufacture and numerous other features as will be apparent from a consideration of the specification and drawing of a form of the invention, which may be preferred, in which:

Figure 1 is a vertical sectional view illustrating a form of fluid power device of my invention;

Figure 2 is a top plan View of the construction shown in Figure 1, part of the apparatus being shown in section for purposes of illustration;

Figure 3 is a vertical sectional view taken substantially on the line 3-3 of Figure 1;

Figure 4 is a vertical sectional view taken substantially on the line 4-4 of Figure 1;

Figure 5 is a vertical sectional view taken substantially on the line 5--5 of Figure 1;

Figure 6 is an end view of the construction shown in Figure 1;

Figure '7 is an isometric view illustrating one of the vanes forming a part of the device;

Figure 8 is a diagrammatic View illustrating positions of a shiftable element of the pump;

Figure 9 is a vertical sectional view illustrating a modified form of adjusting means for shifting one of the pump elements;

Figure 10 is an end view of the construction shown in Figure 9, and

Figure 11 is a top plan view of the construction shown in Figure 9, part of the structure being broken away for purposes of illustration.

It-is to be understood that while I have shown the arrangement of my invention as embodied in physical form of a structure particularly adaptable as a fluid pump or which may be utilized as a motor actuated by fluid under pressure, it is contemplated that my invention may be incorporated in other instrumentalities, or used in conjunction with other mechanisms or arrangements wherever the same may be found to have utility.

Referring to the drawings in detail, and first with reference to the form of the invention as disclosed in Figures 1 through 7 wherein such embodiment is particularly operable as a fluid pump, the arrangement is inclusive of a support of plurality of threaded members or screws I9" extending into thread-ed openings formedyin" the peripheral end wall portion of the housing. The

member I8 is bored to receive a; shaft 25' whichcarries at its inner end an eccentric cylindrical portion or member 23, the surface ofthe latter being generated about an axissoutofalignnient:

with the axis of shaft 2!. The shaft 2| is arranged for limited rotational movement for changing or shifting the -relative position of the eccentric member 23 for-purposes to behereinafter-explained.

The-housing H3 isformed to receive a-shaft-Zt upon-which a rotor-construction is assembled. as

hereinafter described. The shaft 26 extends into the housing and terminatesadjacent to but slight- 1y spaced from the eccentric portion 23 of shaft 21. A- portion of the shaft -extendsexteriorly of the'housing Iii andis' adaptable toreceive or be connected to asleeve-or coupling (not shown) for'connecting-the fiuid power device to a source of power when used asapump or to mechanismsto 'be driven When-the device is utilized.

as a fluid motor.

The shaft 25 is formed with aseries of cylindrical portions 3l--3E32 ofdifferent diameters as particularly shown in Figure 1. The housing E9 is formed with-a portion ll which is provided with a recess adapted to receive and accommodate the outer race 35 of a roller. or other antifriction bearing 3-1, the innerrace 38 of the bearing being snugly fitted upon portion 33 formed on shaft 26. A stuifing gland construction surrounds shaft 26 and is mounted in a cap or closure d2 secured to the housing If] by meansof screws 43 which extend intothreaded openings formed in .the wall of the reduced portion l l oft-he housing H3. The closure 32 is formed with an annular. flange portion AB-Which mates with a boss portion i t formed on the housing to form ca tight joint and accurately position the cap :2. The cap l2 is formed with a cylindrical recess surrounding the shaft 28 in which is disposed packing or sealing mamrial 48 which is'compressed'into sealing engagement with shaft fit-bymeansof a. bushing 49, the latter having an enlarged threaded portion 58 co-operating with a threaded: opening 5i in the closure 42.

It should be noted. that the inner race 38 of thesroller. bearing. 31 abuts the cylindrical portion 3! formed on the shaft 26; while the annular shoulder engages and properly positions'the': outer race. 36 of the bearingtl.

Mounted upon the cylindricalportion 32 :of the shaft 26 isanelementor plate forming apart of a rotor or rotor; construction. 55, a;hub.por tion.5:'l ofthe e1ement'55being secured. topor tion 32 of shaft 26' by means ofa key 58; Spacedfronrthe element 55- is another similarlyshaped'" plate or element 59 which is formed with a'hub" or-projection fifi'up on which is mounted the inner race 6| of a roller or other suitable antifriction bearing562; the. outer race 53, of the bearing being disposed in 'a suitable cylindrical recess formedin-the closure or member I8.

Disposed between the elements 55 and 59 is an annular element or ring 65 provided with a series of spaced openings which register with openings in elements 55 and 59 and which are adapted to receive screws 6'6 for securing elements 55, 59, and 65 in fixed or assembled relationship. As shown in Figure 1, a disc-like plate or element 68 is fixedly secured to element 55 by rivetsts or other suitable means. The annular element 55 is formed with a plurality of spaced kerfs or slots adapted to snugly yet slidably receive and accomm'odate vanes or blades E0. The inner edges or edge surfaces H of the vanes are adapted to abut or engage the exterior cylindrical surface of another" annular-element 2 3 which surrounds and is fittedupon the' outer race i l of an antifriction or.,1ro1-ler bearingjifi, the inner race it of bearing 75 being snugly fitted upon and supported by theportion 23 on shaft 2 i.

The vanes or blades "it are constantly urged into-engagementwith the exterior surface of annular member 13.under. the influence of a band,.

annulusuorv other suitable. retaining. means 85..

which in the embodiment illustratedembraces .or. overlies theoutermostendsor endsurfaces 8i of.the vanes..'ltl.-. As showninFiguresl. and..7,

each of; the .vanes IE3. is formedzonritsouter. edge portion with. the recessed surface- 5| bounded laterally by shoulders. 82, the. recess 81. being.

adapted. to accommodate. andposition the. an.- nular vane. retainingmeanstor-band 80..

It. should be. noted from Figures 1 and. 3Jthat when the portion or member. 2 Sis in-the position illustrated, i. e., with .proj ection.,f23 .eccentrically disposed with respect ;to the. axis: of.shaft 2e that there is formed between the; exterior surface of.

element .73.. and interior surfacev of element 55, a

crescent-like. configuration or. space 18.5 .which .is.

divided by means. ofrthe .vanesllll: into a plurality of. fluid receiving. or pumping chambers H38.

AswilLbe. seenfrom Figures 1,2,. 4 and 5.; the housing or. support. is formed with. projecting bosses 8.7 and..8.8.which.-are. bored toiorm fiuid conduits; 391 and. 9!]: having. enlarged. threaded. entrances adapted: to; receivethe; threaded ex tremities. of fluid. conveying. pipes. 93 and; 94 as shown in Figure 2; The conduits. or passages:8.9

and} 99 are in communication.respectively, with. sector-shaped reservoirs or chambers 96 and;9.l'

as .shown in Figure "5; It should; be. noted: that the chambersfiB and .91 are separated. by means of walls or abutments 98- and; 99 integrally formed with. the. housing Iii; and: terminating at the peripheral surface ofxthe hubiportion 5! of element, and while the exterior cylindrical surface of the hub is closely fittedwithin'the.abutments 98 and 99; suflicientclearance. is provided to. permit rotation orv runningfit of the hub. 51 in the housing I 0.

As shown in Figures 1 and 5 the-hub portion 57 is provided; with a series ofspaced radially extending ducts or passagesl 0 I, each of the ducts NH being in communication with-ducts ifiiiprovided in the'hub' portion 57 of member 55 and extending in a directionxparallel with the axis of shaft 26. As particularly shown'in Figure 4, the ducts 132 are arrangedin registration With radi ally disposed passages or recesses iii3iformed in a wall of the plateorelement 68 which, in cooperation Withinner wall of element 55; forms a series of ducts or channels of substantially rectangular cross section. The periphery ofplate 68 is provided with a series of recesses or passages I which are in communication with channels 103; each of passages lfla'being in-communication with one of the fluid receiving and conveying chambers I08 formed by reason of the vanes I subdividing the crescent shaped space 85.

My invention is inclusive of means for adjusting or shifting the position of the member 23 and annular element or ring "I3 with respect to the axis of shaft 2I for the purpose of accomplishing several novel and advantageous results. By adjusting the relative position of the members or elements 23 and I3, the Volume of fluid or 011 passing through the fluid power device may be controlled and varied by varying the size of the pumping chambers or pockets I08. The member 23 is arranged to be shifted to a neutral or central position in which the axis of member 23 is in alignment with the rotor shaft 26, in which position the rotor construction may revolve or rotate without effecting any pumping action of the device by reason of the fact that all of the fluid receiving or pumping chambers I08 do not vary in size during rotation. The member 23 and ring I3 may be further shifted through the central or neutral position so as to cause the rotor device or construction to pump fluid in a reverse direction without changing the speed or direction of rotation of the rotor construction.

The adjusting means for member 23 and ring I3 includes a manipulating arm or member IIZ which is secured to the extremity of shaft 2| by means of a key 4. A suitable locking means is provided for retaining the adjusting means in adjusted position. In the embodiment illustrated in Figures 1 and 6, the member IIZ is provided with a boss portion I I5 formed with an arcuately arranged slot or opening III). The end closure I8 is provided with a threaded opening IIB adapted to receive a threaded member H9 or other suitable means for holding the arm I I2 in adjusted position. Leakage of fluid from chamber I5 along the shaft 2|, is prevented by means of a stuffinggland IZI surrounding shaft ZI, and is of the same general construction as the stuffing gland 48, 49 surrounding the shaft 26.

As indicated in Figures 6 and 8, point A indicates the axis of eccentric member 23 in its extreme uppermost position, point B illustrates the neutral or central position thereof, in which position no pumping effect will be obtained even though the pump rotor is revolving, while point C indicates the axis of member 23 in its lowermost position viz, a position of reversible pumping action.

The operation of the embodiment of the invention illustrated in Figures 1 through 8 inclusive is as follows:

The fiuid power device when used as a fluid pump requires the application of power to rotate the shaft 26, hence causing rotation of the rotor construction 56 including elements 55 and 59, annular element 95, annulus or ring I3 and vanes 70. It should be noted that these elements and vanes together constitute a rotatable pumping instrumentality when the axis of ring I3 is out of alignment with the axis of shaft 26 in which the parts rotate together and wherein a very small relative sliding movement takes place between the vanes and associated elements thus reducing friction and wear to a minimum and obtaining a maximum of operating efficiency. As the element 5'5 is keyed to the shaft 26, the element '55 carrying with it the vane driving means or element 65, serves to drive or move the vanes or plates I0 with the rotor construction. As will be seen from Figures3, 6, and 8, with the projection or member 23 and annular ring I3 at their v uppermost position at a maximum degree of eccentricity on one side of point B, the axis of the rotor shaft 26, the eccentric relation between the annular ring I3, rotating annulus 65 and vanes 70 causes radial reciprocatory movement of thevanes III as they are bodily carried by the annulus 65 in its rotative movement. As the vanes 10 move radially inwardly and outwardly, the pockets or pumping chambers I00 vary in volume from a minimum size as illustrated at.

the uppermost central portion of Figure 3, to the maximum volume attained by a chamber I08 as illustrated at the lower portion of Figure 3. Thus with the adjusting means or arm I I2 set in the position indicated in Figure 6 with the member 23 and ring I3 in their maximum uppermost position of eccentricity, a pocket I08 disposed between pairs of vanes 10 and of a minimum size, reaches its maximum-volumetric capacity or size and returns to its minimum size during a complete revolution of the rotor. By reason of the continuous increase and decrease in the volumetric size of the pockets or chambers I08 during rotation of the rotor, a suction or lowered pressure is developed in each pocket or chamber during an increase in the size thereof, and reciprocally, higher pressure is developed in the pockets or chambers I00 as they decrease in size. Thus, assuming that the rotor construction is rotating in a clockwise direction as viewed in Figures 3 and A, certain of the ducts I|0I, I02, I03 and I05 are in communication with the chamber or reservoir 99 containing fluid, as for example oil, which is conveyed to. the chamber 96 through a pipe or conduit 93. As the pumping chambers I08 are enlarged or increased in volume in the right-hand 180 degrees of rotative movement of the rotor, viz., that sector of rotation to the right of the plane DE in Figure 3, suction or reduced pressure is being set up in the enlarging chambers. The reservoir 99, and ducts connecting the pockets I08 and the reservoir provide passages so that oil or other fluid in the reservoir or chamber 96, conveyed to it by pipe 93 from a source of supply, flows through the communicating ducts IOI, I02, I 03 and I05 into the enlarging pockets I08 formed by the walls of the vanes 19, elements 59 and 08, the exterior peripheral surface of the annulus 73 and the interior surface of the vane driving element 65. By referring specifically to the disclosures of Figures 3 and 5, it will be noted that as the entrances of ducts IOI are closed as they move past the abutment or wall 99, the pocket whose entrance IOI is blocked off is thus out of communication with the fluid reservoir 96. This would be thecondition of the lowermost pocket I08 as shown in Figure 3 and the lowermost duct II]! in communication therewith shown in Figure 4. As the rotor continues in its clockwise rotation, the pockets on the left-hand 180 degree are of movement of the rotor, i. e., the are at the left of the plane DE, are caused to decrease in size, thus setting up pressure upon the fluid trapped in the pockets by reason of their decreasing size. As the pockets on the left-hand 180 degree are of movement of the rotor are then in communication with the chamber 9'1 through the communicating ducts IIiI, I02, I03 and I05, the fluid or oil from the pockets I06 which are decreasing in size is extruded or forced under pressure into the receiving reservoir or chamber 97, from whence the oil may be directed through the outlet and tube 94 to actuate or operate mechaassascm nisms-;- amiaratusaon for vany otheriuseful purpose r desired;

It; should bevnoted: that as: the vanesv-lfivare being carriedsorrotatedi by the annularelement 65;, the vanes; III-1 slide: radially with. respect: to

the annulus, 65: in: engagement therewith; the n inner :radially'sliding distance traversed by each vane-1 during one; revolution of th6x10t0r being equal to substantially; twiceztheo eccentricity of portion 23, thatzis, fountimes the: lateral dimension: between the:.-axes;f:the:shaft 26' and member .231 As the-.several. elements--constituting; the rotorand thelvanesare-rotated simultaneous- 1y, there is;a very, smallrarcuate or'peripheral relatives,- reciprocatiom. between the ends; or end surface. of. theva-nes. in engagement with the inner. annulusiorw elementv I3 and, the vane retaining bandallfl; Thus-the:onlyrrelative-esliding frictionis ther radial linear: movementof: the; vanes and a slight; reciprocatory arcuate: movement. of the vanes ,withrespect-to the annular elements 13 and 80; Itiwillthereiore:beeseenthat in" my power device; sliding friction: is reduced to aminimum, and consequently there: is no appreciable drag between athe vanes and the members or elements in engagen'rent.therewith.v This-arrangement reduces-"wear of theparts and.--greatly prolongs; the:

life of theimechanism;: eliminates-or greatly minimizesi-leakagezof fluid .as-iwell as ;requiring; much less; power to; actuateether-rotor and vaneconstruction.

The pumping; effectiveness of the. fluid power device-..mayibe. regulated,gthedirection of fluid flow from the pump may beacompletely reversed, or the flow'ofsfluidmay be reduced-to zero without stopping;rotation of; the rotor 56 andshaft 26. This" may-be accomplished simply by mae nipulation: oflthe-e arm? or lever II2 which contI'OISxth-B "relative;- position. of member 23' and the annular membera'l? By, loosening the bolt orthreadedimember I I9,.the. arm, I I2 may be moved in a.clockwise direction as-viewedin Figure ..6,.

such movement causingItheaXisA of the eccene trically disposedmember 23 to approach theneu: tralposition: orpoint B-as illustrated in Figures 6 and 8. The armil I2'ma-y be lockedin any positionby simply tighteningv the. bolt H9. Aspoint A.. is i moved I; closer. to.- neutral. position indicated by. B, such movement causes the axis of member 23'andannularmembenf4 to approach point. Bnwhich. is-in concentriorelationship to .theivane carrying element 65* and. hence. to afiect a de:-

crease in the, size of" the. pockets or pumping; Should the. arms I12" be. moved to. at position in, whicliipoint Alisicoincid'ent with i chambers I03.

point'B'; i.. e., with theaxis. of member 23' and annular ring'I3 in alignment; with theshaft 25,

these elements" are thenin true concentric rela-.

tionship with respect: to the annular elements;

forming in the component parts of the; rotor, in which position, the rotor construction even though rotating; doesnot causeany' pumping a'c= tion' as'the vanes III will not becaused" to moveradially, andhence there" is no increase ordecrease in the sizes 'of-the pumpingchambers'or oil'is taken into the pockets I 08 from the reser voir; 9,1, and: delivered underipressurersetnup; by;- the pumping; action.- of; the? vanesaintoithezresere' voir 96. A maximum pumping, position in: a'pree' verse direction of fluid;flow'is:obtained;when:the

5; arm" I I 2 I is moved-tov its-maximum clockwise position to bring the: axis of? the member. 23 and; the: annular member: I3: to the position indie cated' by pointC iii-Figures Geand-Bf, Thus-the.- efiectivepumping actionzin a reverse .direction'sof i fluid flow may be obtained with the axis ofzmeme ber zt arranged along-the. locus boundedrby points; B: andaC, the furtheraway theiaxis beingjiromi point 1 B; the larger pumping pockets. I 08;; consee,

quently; the, more. volume of oil AVill'; be: pumped;

through the devices: Theseadjustmentsrof arm;

I I 2 and: the components or: elements controlled thereby: for regulatingtheepumping effectiveness; directionxof fl'uid' fiOWfOI neutral; positionofithea device are accomplished w-ithoutsinterferingr with;

:; thetrotation OfFthB driving: shaft 26- andthe'roton- 255. it" is desirable to" obtain a; variable; rate of: flow constructionv 56.

It ,willlthus' be. seen that-the devicerofttmy ins ventionzis readily: adaptedrrforguse withzmachine: tooltcontrol mechanisms and the'likexorrwherever ula'tingwhe effectiveness ordirectiomofifluidzflow of the 1 pumping device: Ina thisfembodimentiz of. the invention there; is'"seoured;tcr the portion. I6

'icfthepump housing or: support I0 I a1 modified" form of' closure IE which is: held imposition." by

means ofscrews :I 9'5. Inxthis form OfCOIlStIllCtiOIl'i the member 23 iselongatedYandsprojectsintozand" snugly fitsa bore formed'in a vertically adjust M -able member or slide" I26, a comparatively long' bearing surface being providedf'for member 231" by reason of a'proj-ecting hollow'bossportion I21! formed ontheslide: Aspartioularly shown'in' Figuresl'O-and 11 the verticalmovable member I ZB' is retained between' suitable ways or barse- I 28? which are secured'to member I26 by means of; screws I29.

Disposed'above the closure member I8 is 'aacap or member I30" which is secured thereto by means: of screws I31 extending intozthrea'dedopenings I32 formed in member I8 Tliecap I3fiis=formed with an upwardly extending boss I34 which isz b'ored'to receive a tenon portion I35 of a threaded member'IQE; The slidable member I26 is pro vided with a threaded opening I3'Tto receive the threaded-member I36; ihe member I 3B-is formed integrally with a-collar I38 whi'ch is disposed in a recess formed in' cap I31 A manipulating means or knob IMF-isprovided'whiohis secured to-the upper end of the tenon I35 by meansof a I dowel or'pin I41 extending through registering openings formed in the manipulating'knob' I and thetenon' portion I35.- A square type of thread'is preferably used on'member I3Ii-in order to minimize wear.

By rotating themanipulating knob Mil' rota-- tion of threaded member I36 is effected, and as the threaded member I36 is held in a relatively stationary position by engagement ofcollar I38 with member IBIL-vertical'movement is imparted to theslide' I23, thedirection ofmovement of the slide-dependingupon the direction of rotation of knob ma. Thus vertical movement of slide I26 carrying with it the member '23, the bearing I5 and the annular member I3; will vary-'the posi' tion of these elements or members to regulate the size of the pumping pockets or chamber 198 to obtain the same adjustments and control of the effective pumping action of the pump and the direction of the fluid therethrough in the same general manner as is obtained by the arrangement shown in the embodiment of Figures 1 and 6. In the form of controlling means illustrated in Figures 9 through 11 inclusive, the axis of member 23 is movable in a vertical plane, while in the form shown in Figures 1 and 6 the axis of member 23 moves in an are as exemplified in Figure 6 and the diagrammatic illustration in Figure 8.

When the forms of my invention herein disclosed are utilized as a fluid motor, i. e. when they are actuated. by fluid under pressure conveyed to the pumping chamber ms, the speed of the rotor so driven may be regulated by chang ing the relative position of members 23 or 23' and the direction of movement of the rotor may be reversed when members 23 or 23' are moved to the opposite side of point B illustrated in Figures 6 and 8. By utilizing two instrumentalities of my invention as disclosed herein and connecting the devices in series through connection of the fluid pressure line from one instrumen tality to a second instrumentality, a variable speed transmission device useable for many purposes may be obtained. When two of the de vices of my invention are so used, one as a pump and the other as a fluid driven motor, the control is preferably effected by moving the eccentric of the pump device, which varies the flow of fluid to the motor and hence changes the speed of the latter. The eccentric control of the motor device of such a tandem arrangement may be ad- ,iusted to any position at one side of the central or neutral position, and thus vary the speed of the motor by fluid conveyed to it from the pump. It should be noted in this connection that moving the eccentric in the fluid device used as a motor toward the central or neutral position lessens the volume of the fluid chambers in the motor, and hence causes an increase in the speed of the motor rotor. When. the fluid pump of such a pump and motor arrangement is in operation, the axis of the eccentric of the fluid motor must be out of alignment with the axis or center of the motor rotor shaft, as the motor will not rotate when the axis of the eccentric and the axis of the motor rotor shaft are in alignment. This is due to the fact that there will then be no change in the size of the fluid receiving chambers of the fluid motor rotor during rotation thereof.

It is apparent that, Within the scope of the invention, modifications and different arrangements may be made other than is herein disclosed, and the present disclosure is illustrative merely, the invention comprehending all variations thereof.

What I claim is:

1. In combination a support, a rotor including a pair of disc-like elements secured together and journaled for rotatable movement on said sup port; an annular element disposed between said disc-like elements; said annular element being formed with a plurality of slots; radially movable vanes slidably disposed in said slots; an annular member disposed between said disc-like elements, the exterior cylindrical surface of said annular member adapted to be engaged by the inner edge walls of said vanes; said annular member being arranged for rotation concurrently with the rotation of said rotor; said disc-like elements, vanes and annular element and member forming a plurality of fluid receiving chambers; fluid inlet and outlet passages formed in said support and arranged for communication with said fluid receiv-- ing chambers; means including a deformable band engageable with the outer edge walls of said vanes for urging the latter into frictional engagement with the annular member; a shaft member; said annular member being journaled for rotation upon said shaft member; said support being formed with a pair of guides; a member carrying said shaft member and arranged for movement in said guides; means cooperating with said shaft supporting member for moving said shaft member laterally with respect to the axis of rotation of said rotor.

2. In combination a support, a rotor including a pair of disc-like elements secured together and journaled for rotatable movement on said support; an annular element disposed between said disc-like elements; said annular element being formed with a plurality of slots; radially movable vanes slidably disposed in said. slots; an annular member disposed between said disc-like elements, anti-friction bearing means for supporting said annular member for rotation concurrently with the rotation of said rotor the exterior cylindrical surface of said annular member adapted to be engaged by the inner edge walls of said vanes; means including a deformable band adapted to be resiliently tensioned into engagement with the outer edge walls of said vanes for urging the latter into engagement with the annular member; said vanes, disc-like elements, annular element and member forming a plurality of fluid pumping chambers; a shaft member; said annular member being journaled for rotation upon said shaft member; said support being formed with guide means; a member carrying said shaft and arranged for slidable movement in said guide means; and threaded means cooperating with said shaft member for moving the shaft member laterally with respect to the axis of rotation of said rotor to vary the capacity of said fluid pumping chambers.

3. In combination, a support; a rotor construction including a pair of disc-like elements secured together and journaled for rotatable movement on said support; an annular element disposed between said disc-like elements and secured thereto; said annular element being formed with a plurality of spaced slots; radially movable vanes slidably disposed in said slots; an annular member having an exterior cylindrical. surface; anti-friction bearing means supporting said annular member; said vanes slidably engaging the exterior cylindrical surface of said member and forming with said disc-like elements and said annular element a plurality of fluid pumping chambers; said annular member being arranged for transverse movement relative to the rotor construction, and an annular deformable band engageable with the outer edge walls of said vanes for urging same into engagement with the exterior cylindrical surface of the annular member.

4. In combination, a support; a rotor including a pair of disc-like elements secured together and journaled for rotatable movement on said support; an annular element disposed between said disc-like elements and secured thereto; said annular element being formed with a plurality of spaced slots; radially movable vanes slidably disiii-Z1 posed in said'sldts; an annular member having: a -cy1indrica1 surface; :said. annular :member be- :ingEarranged for; rqtationsconcurrently ,iwith ithe :vrotation. of zsaid rotor; said:vanes.frictiona11y zen- --gaging the cylindrical surface of .;said annular qmern'ber-and forming'with-said discdikeelements and --said annular element :a plurality of ..fiuid pumping chambers; a .pluralityiof fluid passages communicating with -said pumping chambers; said annular member being arranged forlateral -movementrelative ,tothe. .rotor, for changing the size of said chambers and the direction .of fluid 'flowtherethroug'h and through saidfluid pas- .sages during rotation of said rotor, and ancannula'r *deformableban'd engageable with the outer edge walls of said vanes for urging same into en- "gagement with the cylindrical surface.

'EDD C. "OLIVE-R.

212 LREEERENCESCCHED The "following references are of "recordfiin the ffile of this patent:

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